The below is the compiled list of aggregate, analytical & advanced functions in Apache Hive. Some of them are widely used ones which we will
Category: Apache Impala
Concatenate rows (group concatenation) in MySQL, Hive, SQL Server and Oracle
The CONCAT() function joins the input strings or different column values and returns as a single string. However, if we need to concatenate rows of
DISTINCT vs APPROXIMATE DISTINCT
As all (or most) of us know, SELECT DISTINCT eliminates duplicate records from the results and returns only unique values. But it’s very expensive in
Creating Table From Existing Table in Hive, Impala, SQL Server, Oracle SQL*Plus, PostgreSQL and MySQL
In some scenarios we may need to create a table based on the existing ones. Sometimes we may need the table along with the data
Best Usage of NTILE function in SQL Server and other RDBMSs
SQL Server NTILE() is a window function that distributes rows of an ordered partition right into a unique quantity of approximately same partition or group
Calculating “Approximate Median” in Cloudera Impala, Apache Hive, SQL Server, Oracle and MySQL
APPROX_MEDIAN is an approximate inverse distribution function that accept a nonstop/continuous dispersion model. It takes a numeric or datetime value and returns an estimated middle
Big Data & SQL 